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Sulfur in its +1 oxidation state, as found in species like S2O3^2- (thiosulfate) and S2O4^2- (dithionite), is unstable with respect to disproportionation. This means that the sulfur in these species will spontaneously react to form sulfur in a lower oxidation state (like elemental sulfur, S(0)) and sulfur in a higher oxidation state (like sulfate, SO4^2-) under suitable conditions.